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We investigated the impact of sequence divergence on DNA double-strand break (DSB) repair occurring via recombination in cultured thymidine kinase deficient mouse fibroblasts. We stably transfected cells with a DNA construct harboring a herpes thymidine kinase (tk) gene (the “recipient”) rendered nonfunctional by insertion of an oligonucleotide containing the recognition site for endonuclease I-SceI...